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01bd62517c
The tls.h inclusion is not really required and limits possible definition on more arch specific headers. This is a cleanup to allow inline functions on sysdep.h, more specifically on i386 and ia64 which requires to access some tls definitions its own. No semantic changes expected, checked with a build against all affected ABIs.
108 lines
3.0 KiB
C
108 lines
3.0 KiB
C
/* Pseudo implementation of waitid.
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Copyright (C) 1997-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1997.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <sys/wait.h>
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#include <stddef.h>
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int
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__waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)
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{
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pid_t pid, child;
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int status;
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switch (idtype)
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{
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case P_PID:
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if (id <= 0)
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goto invalid;
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pid = (pid_t) id;
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break;
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case P_PGID:
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if (id < 0 || id == 1)
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goto invalid;
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pid = (pid_t) -id;
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break;
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case P_ALL:
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pid = -1;
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break;
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default:
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invalid:
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__set_errno (EINVAL);
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return -1;
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}
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/* Technically we're supposed to return EFAULT if infop is bogus,
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but that would involve mucking with signals, which is
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too much hassle. User will have to deal with SIGSEGV/SIGBUS.
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We just check for a null pointer. */
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if (infop == NULL)
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{
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__set_errno (EFAULT);
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return -1;
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}
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/* Note the waitid() is a cancellation point. But since we call
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waitpid() which itself is a cancellation point we do not have
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to do anything here. */
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child = __waitpid (pid, &status, options);
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if (child == -1)
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/* `waitpid' set `errno' for us. */
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return -1;
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if (child == 0)
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{
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/* POSIX.1-2008, Technical Corrigendum 1 XSH/TC1-2008/0713 [153] states
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that if waitid returns because WNOHANG was specified and status is
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not available for any process specified by idtype and id, then the
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si_signo and si_pid members of the structure pointed to by infop
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shall be set to zero. */
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infop->si_signo = 0;
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infop->si_code = 0;
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return 0;
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}
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/* Decode the status field and set infop members... */
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infop->si_signo = SIGCHLD;
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infop->si_pid = child;
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infop->si_errno = 0;
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if (WIFEXITED (status))
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{
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infop->si_code = CLD_EXITED;
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infop->si_status = WEXITSTATUS (status);
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}
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else if (WIFSIGNALED (status))
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{
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infop->si_code = WCOREDUMP (status) ? CLD_DUMPED : CLD_KILLED;
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infop->si_status = WTERMSIG (status);
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}
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else if (WIFSTOPPED (status))
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{
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infop->si_code = CLD_STOPPED;
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infop->si_status = WSTOPSIG (status);
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}
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return 0;
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}
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weak_alias (__waitid, waitid)
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strong_alias (__waitid, __libc_waitid)
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